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    <title>Document</title>
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        table {
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        thead tr {
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        tbody tr {
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        tbody td {
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        .bg{
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<body>
    <table>
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            <tr>
                <th>代码</th>
                <th>名称</th>
                <th>最新公布净值</th>
                <th>累计净值</th>
                <th>前单位净值</th>
                <th>净值增长率</th>
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            <td>1.075</td>
            <td>1.074</td>
            <td>+0.047%</td>
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    <script>
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        //2.利用循环绑定注册事件
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            //3.鼠标经过事件 onmouseover
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                // console.log(11);
                this.className = 'bg';
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